Sparkling mineral water at 25 °C contains 0.033 M H₂CO₃(aq) from dissolved CO₂ and…

CHEMISTRY · Single correct · AP · Chemistry · Equilibrium · Equilibrium

Problem

Sparkling mineral water at 25 °C contains 0.033 M H₂CO₃(aq) from dissolved CO₂ and 0.010 M Ca²⁺. Given Ka1(H₂CO₃)=4.3×10−7K_{a1}(\text{H₂CO₃})=4.3\times10^{-7}, Ka2(H₂CO₃)=5.6×10−11K_{a2}(\text{H₂CO₃})=5.6\times10^{-11}, and Ksp(CaCO₃)=4.8×10−9K_{sp}(\text{CaCO₃})=4.8\times10^{-9}, at what pH will CaCO₃(s) just begin to precipitate from the solution? (a) 8.48.4 (b) 4.94.9 (c) 5.95.9 (d) 10.110.1

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